--- a/hgext/hgmo/__init__.py
+++ b/hgext/hgmo/__init__.py
@@ -450,16 +450,25 @@ def automationrelevancewebcommand(web, r
     # So we pre load and cache data for pushlog entries we care about.
     cl = urepo.changelog
     nodes = [cl.node(rev) for rev in revs]
 
     with repo.unfiltered().pushlog.cache_data_for_nodes(nodes):
         for rev in revs:
             ctx = urepo[rev]
             entry = webutil.changelistentry(web, ctx, tmpl)
+
+            # The pushnodes list is redundant with data from other changesets.
+            # The amount of redundant data for pushes containing N>100
+            # changesets can add up to megabytes in size.
+            try:
+                del entry['pushnodes']
+            except KeyError:
+                pass
+
             # Some items in changelistentry are generators, which json.dumps()
             # can't handle. So we expand them.
             for k, v in entry.items():
                 # "files" is a generator that attempts to call a template.
                 # Don't even bother and just repopulate it.
                 if k == 'files':
                     entry['files'] = sorted(ctx.files())
                 elif k == 'allparents':

--- a/hgext/hgmo/tests/test-automationrelevant-obsolete.t
+++ b/hgext/hgmo/tests/test-automationrelevant-obsolete.t
@@ -113,20 +113,16 @@ Unless --hidden is used
           "d406a5ad38f255efb8657338e56a2bd6b8149cca"
         ],
         "pushdate": [
           \d+, (re)
           0
         ],
         "pushhead": "3208166ea10954e86c390c32fe6f7166f06161b2",
         "pushid": 3,
-        "pushnodes": [
-          "11743f8081842eb047711e85120177ed46be343e",
-          "3208166ea10954e86c390c32fe6f7166f06161b2"
-        ],
         "pushuser": "testuser",
         "rev": 3,
         "reviewers": []
       },
       {
         "author": "test",
         "backsoutnodes": [],
         "bugs": [],
@@ -146,20 +142,16 @@ Unless --hidden is used
           "11743f8081842eb047711e85120177ed46be343e"
         ],
         "pushdate": [
           \d+, (re)
           0
         ],
         "pushhead": "3208166ea10954e86c390c32fe6f7166f06161b2",
         "pushid": 3,
-        "pushnodes": [
-          "11743f8081842eb047711e85120177ed46be343e",
-          "3208166ea10954e86c390c32fe6f7166f06161b2"
-        ],
         "pushuser": "testuser",
         "rev": 4,
         "reviewers": []
       }
     ],
     "visible": false
   }
 

--- a/hgext/hgmo/tests/test-automationrelevant.t
+++ b/hgext/hgmo/tests/test-automationrelevant.t
@@ -150,21 +150,16 @@ web command for exposing automation rele
           "cb5c79007e91b09a4ba7ebe9210311491d09e96e"
         ],
         "pushdate": [
           \d+, (re)
           0
         ],
         "pushhead": "5d04c4fd236c19e241d1587e120b39840344eee8",
         "pushid": 3,
-        "pushnodes": [
-          "13855aae8fb3291c663ff46a8510c0e3fa673a4c",
-          "66a66c6c6ae312ec88240754300468a6cea8f71d",
-          "5d04c4fd236c19e241d1587e120b39840344eee8"
-        ],
         "pushuser": "testuser",
         "rev": 3,
         "reviewers": []
       },
       {
         "author": "test",
         "backsoutnodes": [],
         "bugs": [],
@@ -184,21 +179,16 @@ web command for exposing automation rele
           "13855aae8fb3291c663ff46a8510c0e3fa673a4c"
         ],
         "pushdate": [
           \d+, (re)
           0
         ],
         "pushhead": "5d04c4fd236c19e241d1587e120b39840344eee8",
         "pushid": 3,
-        "pushnodes": [
-          "13855aae8fb3291c663ff46a8510c0e3fa673a4c",
-          "66a66c6c6ae312ec88240754300468a6cea8f71d",
-          "5d04c4fd236c19e241d1587e120b39840344eee8"
-        ],
         "pushuser": "testuser",
         "rev": 4,
         "reviewers": []
       },
       {
         "author": "test",
         "backsoutnodes": [],
         "bugs": [],
@@ -218,21 +208,16 @@ web command for exposing automation rele
           "66a66c6c6ae312ec88240754300468a6cea8f71d"
         ],
         "pushdate": [
           \d+, (re)
           0
         ],
         "pushhead": "5d04c4fd236c19e241d1587e120b39840344eee8",
         "pushid": 3,
-        "pushnodes": [
-          "13855aae8fb3291c663ff46a8510c0e3fa673a4c",
-          "66a66c6c6ae312ec88240754300468a6cea8f71d",
-          "5d04c4fd236c19e241d1587e120b39840344eee8"
-        ],
         "pushuser": "testuser",
         "rev": 5,
         "reviewers": []
       }
     ],
     "visible": true
   }